Well, they didn't actually test it on the same virus as Covid 19. They used one that is an acceptable substitute. And they did not actually test it on nasopharyngeal tissue. I'm not convinced that it kills enough viral particles to lessen the danger of contagion. Keep your masks on, kids!
Take a look at the last two paragraphs of the study:
Several possible limitations of this work must be acknowledged. We did not use SARS‐CoV‐2 in this study as the virus as it was more expensive, less available, and would have required biosafety level‐3 laboratory conditions. Instead, we used high numbers of infectious HCoV‐229e, a common surrogate for SARS‐CoV‐2. This allowed us to rapidly test a multitude of products at varying contact times to identify potential rinses and optimal wash times in the mitigation efforts against COVID‐19. Second, we used an in vitro suspension of the virus with soil as a surrogate for oral and nasopharyngeal debris. Although this condition has been used previously, it is possible that this does not represent the true nature of the nasopharyngeal endothelial ecosystem. Third, the in vitro suspension does not consider the potential mechanical action from the act of rinsing. It is possible that in vivo agitation during a rinse may assist in viral load reduction or alternatively decrease effect by altering contact time with viral particles. Future clinical trials will be needed to evaluate the effect of these rinses in patients. Finally, TCID50 assays begin with a 10‐fold dilution, therefore, the lowest reduction level we could measure is 90% or 1 log10. A product may be able to reduce the amount of infectious virus by 50% or 80% which the TCID50 assay would not be able to measure.
5 CONCLUSION
The rapid spread of SARS‐CoV‐2 across the world has created an unprecedented healthcare, social, and economic disaster. With the most significant mode of transmission considered to be through aerosolized droplets,14, 15, 17-20 wearing masks and social distancing can significantly decrease transmission and spread.36 However, these practices have not been universally adopted. While we wait for definitive therapies and vaccines to contain and prevent the spread of SARS‐CoV‐2, additional strategies are required to lessen transmission. Nasal rinses and mouthwashes, which directly treat the major sites of reception and transmission of HCoV, may provide an additional level of protection against the virus. While clinical trials will be necessary to confirm the virucidal potential of these products and assess their ability to limit transmission of HCoV within the general population, in the current manuscript we have demonstrated here that several commonly available healthcare products have significant virucidal properties with respect to HCoV.
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